How to prevent and control pests and diseases in snow peas? A detailed explanation of common control methods
Snow peas, which are what we commonly call peas, do not have high requirements for the growing environment. They can be grown on field ridges, on balconies, or in fields, so many people now grow a few snow peas at home. But when snow peas develop diseases, people are often at a loss. So today Qinnong Net has brought everyone a round of good news, which is to teach everyone some relatively common pest and disease control methods for snow peas. Let's take a look below.
1. Powdery mildew
Powdery mildew generally occurs during the fruiting period of snow peas and in the stage after fruiting, so it has a great impact on the yield of snow peas. The initial symptoms of powdery mildew appear as a small number of pale spots on the leaves and stems of snow peas. If no preventive measures are taken, you will find that the white spots on the leaf surface slowly spread and cover the entire leaf surface, and the same happens on the stems. In the end, it causes the plant to wither and then die. If pods have formed on the vines at this time, the quality of the pods is also very poor. So the ordinary control method is to arrange a reasonable density at planting time, and next to build supports to maintain good air permeability. During the disease period, we can spray with chlorothalonil solution, once every five to ten days, for three to four consecutive times.
2. Brown spot disease
The early symptoms of brown spot disease are also mainly reflected on the leaf surface of snow peas. At first, brown spots of various sizes appear on the leaf surface, and then when you touch them with your hand, you will find that your hand is covered with dark brown powder. Finally, the leaf surface is completely replaced by black spots. There are generally two control methods. One is through ecological means, that is, reasonable fertilization, not favoring nitrogen fertilizer, and next promptly draining water from the field, cleaning up debris in the field, and regularly carrying out intertillage and weeding. Another is to use chemicals for control. We generally use a 1:1:200 Bordeaux mixture or a 75% chlorothalonil wettable powder 500-600 times solution to spray the leaf surface for control.
3. Root rot
The period when root rot most often occurs is during the seedling stage of snow peas. Generally, the disease is most severe when snow peas grow to about ten cm. This disease usually appears in the plum rain season, or when rainfall is relatively high. It is caused by bacterial infection. It mainly damages the roots of the plant, causing the whole plant to lose water and die at the root. First, we can choose varieties with better resistance. Second, during field management, observe weather changes one by one and deal with them promptly. When diseased plants are found, promptly remove the plants, clean the soil thoroughly, and spread a layer of quicklime for disinfection, so as to avoid infecting other normally growing seedlings. Finally, chemical control methods are used, applying metalaxyl hymexazol or copper preparations to irrigate the roots, or using carbendazim for spraying.
4. Aphids
Aphids are also a relatively common pest of snow peas. They mainly harm the tender shoots of snow peas and hinder the growth of snow peas. We can buy some traps specifically for aphids to trap and kill them. Second, we can also make trapping tools ourselves according to the preferences of aphids. Finally, use imidacloprid for control.
5. Pod borers
Pod borers are a very troublesome pest. They mainly feed on the flower buds and tender pods of snow peas, which causes pod drop in snow peas and leaves traces of insect bites all over the pods. Such snow peas have no value at all. So when there are relatively few pod borers, we directly catch and kill them manually, remove the damaged pods, and then spray an appropriate amount of imidacloprid or dimethoate emulsion.